Universality of solar wind turbulent spectrum from MHD to electron scales

Olga Alexandrova; Joachim Saur; Catherine Lacombe; Andre Mangeney; Jeremy Mitchell; Steve J. Schwartz; Patrick Robert

doi:10.1103/PhysRevLett.103.165003

paper

Universality of solar wind turbulent spectrum from MHD to electron scales

arXiv:0906.3236 · doi:10.1103/PhysRevLett.103.165003

Abstract

In order to investigate the universality of magnetic turbulence in space plasmas we analyze seven time periods in the free solar wind of different origin, slow or fast, and under different plasma conditions. The orientation of magnetic field to the flow velocity was always quasi-perpendicular. Unique combination of three instruments on Cluster spacecraft which operate in different frequency ranges give us the possibility to resolve spectra up to 300 Hz. We show that spectra measured under different plasma conditions have a similar shape. Such a quasi-universal spectrum consists of three parts: two power laws and an exponential domain. At MHD scales, Kolmogorov's law $\sim k^{- 5/3}$ is found. At scales smaller than the ion characteristic scales, a $k^{- 2.8}$ law is observed. At scales $k ρ_{e} \sim (0.1 - 1)$ , where $ρ_{e}$ is the electron gyroradius, the magnetic spectrum follows an exponential law $exp (- k^{1/2})$ , indicating the onset of dissipation. This is the first observation of an exponential magnetic spectrum in space plasmas. We show that among several spatial kinetic plasma scales, the electron Larmor radius plays the role of a dissipation scale in space plasma turbulence.

submitted to Phys. Rev. Lett (V2)

Universality of solar wind turbulent spectrum from MHD to electron scales

Abstract

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